Texas Instruments TRF7963A, Manual

Page: 45 / 73

45
TRF7963A
www.ti.com SLOS758G – DECEMBER 2011 – REVISED MARCH 2020
Submit Documentation Feedback
Product Folder Links: TRF7963A
Detailed Description
Copyright © 2011–2020, Texas Instruments Incorporated
6.14.1.2 Protocol Subsetting Registers
6.14.1.2.1 ISO14443B TX Options Register (0x02)
Table 6-19 describes the bit fields of the ISO14443B TX Options register. This register selects the ISO
subsets for ISO/IEC 14443 B transmit.
Default Value: 0x00, set at POR = H or EN = L
Table 6-19. ISO14443B TX Options Register (0x02)
BIT NO. BIT NAME FUNCTION DESCRIPTION
B7 egt2
TX EGT time select. B7 is the
MSB. This 3-bit code defines the number of etu (0 to 7) that separate two
characters. ISO/IEC 14443 B TX only.
B6 egt1
B5 egt0
B4 eof_l0
1 = EOF
→
0 length 11 etu
0 = EOF → 0 length 10 etu
ISO/IEC 14443 B TX only
B3 sof_l1
1 = SOF → 1 length 03 etu
0 = SOF → 1 length 02 etu
B2 sof_l0
1 = SOF → 0 length 11 etu
0 = SOF → 0 length 10 etu
B1 l_egt
1 = EGT after each byte
0 = EGT after last byte is omitted
B0 Unused
6.14.1.2.2 ISO14443A High-Bit-Rate and Parity Options Register (0x03)
Table 6-20 describes the bit fields of the ISO14443A High-Bit-Rate and Parity Options register. This
register l the ISO subsets for ISO/IEC 14443 A transmit.
Default Value: 0x00, set at POR = H or EN = L and at each write to ISO Control register
Table 6-20. ISO14443A High-Bit-Rate and Parity Options Register (0x03)
BIT NO. BIT NAME FUNCTION DESCRIPTION
B7 dif_tx_br
TX bit rate different from RX bit
rate enable
Valid for ISO/IEC 14443 A or B high bit rate
B6 tx_br1
TX bit rate
tx_br1 = 0, tx_br = 0: 106 kbps
tx_br1 = 0, tx_br = 1: 212 kbps
tx_br1 = 1, tx_br = 0: 424 kbps
tx_br1 = 1, tx_br = 1: 848 kbps
B5 tx_br0
B4 parity-2tx
1 = Parity odd except last byte,
which is even for TX
For ISO/IEC 14443 A high-bit-rate coding and decoding
B3 parity-2rx
1 = Parity odd except last byte,
which is even for RX
B2 Unused
B1 Unused
B0 Unused